A. Time during which a member is absent from service on leave of absence whether by reason of having been ordered on duty with the armed forces of the United States or otherwise shall be considered as time spent in city service.

B. Any member so absent shall contribute to the system, either during such absence or upon his return to the service, at times and in a manner fixed by the pension board, amounts equal to the contributions which would have been made by him to the system on the basis of his compensation allowable to the position held by him at the commencement of his leave of absence. (Prior code § 5.38.220)